Function tree_diameter 

pub fn tree_diameter(reader: impl Read, writer: impl Write)

✅ AC 41ms

problem here

Detail

Case Name	Status	Exec Time
example_00	AC	0 ± 0 ms
small_random_00	AC	0 ± 0 ms
small_random_01	AC	0 ± 0 ms
small_random_02	AC	0 ± 0 ms
small_random_03	AC	0 ± 0 ms
small_random_04	AC	0 ± 0 ms
random_00	AC	25 ± 6 ms
random_01	AC	36 ± 3 ms
random_02	AC	2 ± 0 ms
random_03	AC	32 ± 2 ms
random_04	AC	15 ± 1 ms
max_random_00	AC	41 ± 2 ms
max_random_01	AC	41 ± 1 ms
uni_00	AC	21 ± 1 ms
line_00	AC	30 ± 3 ms
hack_00	AC	0 ± 0 ms